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1w16

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{{STRUCTURE_1w16| PDB=1w16 | SCENE= }}
{{STRUCTURE_1w16| PDB=1w16 | SCENE= }}
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'''RAT SYNAPTOTAGMIN 4 C2B DOMAIN IN THE ABSENCE OF CALCIUM'''
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===RAT SYNAPTOTAGMIN 4 C2B DOMAIN IN THE ABSENCE OF CALCIUM===
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==Overview==
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The neuronal protein synaptotagmin 1 functions as a Ca(2+) sensor in exocytosis via two Ca(2+)-binding C(2) domains. The very similar synaptotagmin 4, which includes all the predicted Ca(2+)-binding residues in the C(2)B domain but not in the C(2)A domain, is also thought to function as a neuronal Ca(2+) sensor. Here we show that, unexpectedly, both C(2) domains of fly synaptotagmin 4 exhibit Ca(2+)-dependent phospholipid binding, whereas neither C(2) domain of rat synaptotagmin 4 binds Ca(2+) or phospholipids efficiently. Crystallography reveals that changes in the orientations of critical Ca(2+) ligands, and perhaps their flexibility, render the rat synaptotagmin 4 C(2)B domain unable to form full Ca(2+)-binding sites. These results indicate that synaptotagmin 4 is a Ca(2+) sensor in the fly but not in the rat, that the Ca(2+)-binding properties of C(2) domains cannot be reliably predicted from sequence analyses, and that proteins clearly identified as orthologs may nevertheless have markedly different functional properties.
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(as it appears on PubMed at http://www.pubmed.gov), where 15311271 is the PubMed ID number.
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{{ABSTRACT_PUBMED_15311271}}
==About this Structure==
==About this Structure==
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[[Category: Synaptotagmin]]
[[Category: Synaptotagmin]]
[[Category: Transmembrane]]
[[Category: Transmembrane]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 13:00:47 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 23:09:42 2008''

Revision as of 20:09, 28 July 2008

Image:1w16.png

Template:STRUCTURE 1w16

RAT SYNAPTOTAGMIN 4 C2B DOMAIN IN THE ABSENCE OF CALCIUM

Template:ABSTRACT PUBMED 15311271

About this Structure

1W16 is a Single protein structure of sequence from Rattus norvegicus. Full crystallographic information is available from OCA.

Reference

Structural basis for the evolutionary inactivation of Ca2+ binding to synaptotagmin 4., Dai H, Shin OH, Machius M, Tomchick DR, Sudhof TC, Rizo J, Nat Struct Mol Biol. 2004 Sep;11(9):844-9. Epub 2004 Aug 15. PMID:15311271

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